So, we are facing a decision between two building contracts. We will receive the final offers with all changes in the coming days.
Building contract #1 uses 17.5cm (7 inches) Poroton T18 blocks, while building contract #2 uses 24cm (9.5 inches) Poroton T18 blocks. External thermal insulation composite system (ETICS) is specified as 20cm (8 inches) for both. Now I’m wondering if 17.5cm (7 inches) could present any disadvantages for us, and if so, which ones? Based on gut feeling and the included services, we actually prefer building contract #1.
Thank you very much in advance for your help.
Best regards
Building contract #1 uses 17.5cm (7 inches) Poroton T18 blocks, while building contract #2 uses 24cm (9.5 inches) Poroton T18 blocks. External thermal insulation composite system (ETICS) is specified as 20cm (8 inches) for both. Now I’m wondering if 17.5cm (7 inches) could present any disadvantages for us, and if so, which ones? Based on gut feeling and the included services, we actually prefer building contract #1.
Thank you very much in advance for your help.
Best regards
Regarding your question in the thread: my opinion is NO. Poroton combined with ETICS (External Thermal Insulation Composite System) is not the right choice in my view. If using ETICS, then 17.5 cm (7 inches) calcium silicate bricks, mainly for sound insulation reasons.
I don't think the 17.5 cm (7 inches) Poroton bricks are strong enough in terms of compressive strength for a load-bearing wall. Besides, if using ETICS, I would only rely on calcium silicate bricks. Interior walls can then be built with 11.5 cm (4.5 inches) thickness and still offer better structural stability, heat storage capacity, and sound insulation than Poroton. Also, fixtures on the wall can be mounted more securely.
The construction companies I know and have worked with in the past have always used the bricks I preferred. They might have worse purchasing conditions but were always able to work with any material.
So, if you insist on Poroton plus ETICS, then 24 cm (9.5 inches) thickness would be necessary. But then why can’t bu#1 do it? Everything seems a bit strange...
I don't think the 17.5 cm (7 inches) Poroton bricks are strong enough in terms of compressive strength for a load-bearing wall. Besides, if using ETICS, I would only rely on calcium silicate bricks. Interior walls can then be built with 11.5 cm (4.5 inches) thickness and still offer better structural stability, heat storage capacity, and sound insulation than Poroton. Also, fixtures on the wall can be mounted more securely.
The construction companies I know and have worked with in the past have always used the bricks I preferred. They might have worse purchasing conditions but were always able to work with any material.
So, if you insist on Poroton plus ETICS, then 24 cm (9.5 inches) thickness would be necessary. But then why can’t bu#1 do it? Everything seems a bit strange...
T
toxicmolotof2 Aug 2016 23:48As you can see, there are now two of us who share a similar opinion.
What is wrong with the fact that every brick has thermal insulation properties? What is wrong with the idea that you will get frustrated every time you try to fix something inside the wall?
Brick is simply not the best choice for your construction project.
And no, I have no understanding for the fact that you apparently (still) have no knowledge but present other people’s statements as incorrect without providing any proof.
What is wrong with the fact that every brick has thermal insulation properties? What is wrong with the idea that you will get frustrated every time you try to fix something inside the wall?
Brick is simply not the best choice for your construction project.
And no, I have no understanding for the fact that you apparently (still) have no knowledge but present other people’s statements as incorrect without providing any proof.
@toxicmolotow
A thermal conductivity of 0.18 W/mK for the T18 is a joke, so I don’t even consider that the thermal conductivity of the Poroton T18. For me, a stone has thermal conductivity only if it could also serve as a substitute for an external insulation and finishing system (EIFS) / external wall insulation. Whether filled Poroton bricks are useful or not, we’ll leave aside.
Whether you are two or three people doesn’t matter at all! You have not helped so far. If I ask whether I should buy a green or a yellow car and you answer red, that is simply useless.
@Tom1607
It is not true that a T18 with 17.5 cm (7 inches) is not strong enough in compression for a single-family house. And I never said that builder #1 does not offer any sand-lime bricks. They offer either Ytong or POROTON directly to choose from, but of course you can get anything else as well.
If I’m supposed to consider a sand-lime brick, which one would you suggest?
Best regards
A thermal conductivity of 0.18 W/mK for the T18 is a joke, so I don’t even consider that the thermal conductivity of the Poroton T18. For me, a stone has thermal conductivity only if it could also serve as a substitute for an external insulation and finishing system (EIFS) / external wall insulation. Whether filled Poroton bricks are useful or not, we’ll leave aside.
Whether you are two or three people doesn’t matter at all! You have not helped so far. If I ask whether I should buy a green or a yellow car and you answer red, that is simply useless.
@Tom1607
It is not true that a T18 with 17.5 cm (7 inches) is not strong enough in compression for a single-family house. And I never said that builder #1 does not offer any sand-lime bricks. They offer either Ytong or POROTON directly to choose from, but of course you can get anything else as well.
If I’m supposed to consider a sand-lime brick, which one would you suggest?
Best regards
Only soundproofing comes to mind immediately. However, our plot is located on a dead-end street, which is within a 30 km/h (about 20 mph) traffic zone. The interior walls might need to be taken into account here. I’m putting external noise aside for now due to the reasons mentioned above.
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